Preparation of cationic starch acrylamide flocculant by aqueous solution polymerization

Abstract

In order to obtain a starch glycidyltrimethylammonium polymerization acrylamide (St-GTA-PAM) with high efficiency, easy degradation and no secondary pollution, 2, 3-Glycidyltrimethylammonium (GTA) as etherifying agent, starch glycidyltrimethylammonium (St-GTA) was prepared by semi-dry etherification modification, and St-GTA-PAM was prepared by aqueous polymerization method. The optimum conditions for the synthesis of St-GTA-PAM were investigated by orthogonal analysis of the effects of KPS concentration, St-GTA to AM monomer ratio on the monomer conversion and grafting rate. The experimental results show that the optimal conditions for the aqueous polymerization method that the reaction temperature is 50℃, the ratio of St-GTA to AM monomer is 1∶3, the concentration of KPS is 6 mmol/L, and the reaction time is 5 h. GTA and AM were successfully grafted, and the surface of St-GTA-PAM was rougher and showed a multi-folded network structure. The flocculation performance test of kaolin simulated wastewater showed that the flocculant dosage was 300 mg/L and the pH was 3~10. Under normal temperature conditions, the St-GTA-PAM flocculation rate reached 92.7%, indicating that St-GTA-PAM has strong adaptability to temperature and pH.

Keywords

• therification
• semi-dry method
• starch glycidyltrimethylammonium
• acrylamide
• aqueous solution polymerization